CA2811114C - Method for replacing a transformer in a wind energy installation - Google Patents
Method for replacing a transformer in a wind energy installation Download PDFInfo
- Publication number
- CA2811114C CA2811114C CA2811114A CA2811114A CA2811114C CA 2811114 C CA2811114 C CA 2811114C CA 2811114 A CA2811114 A CA 2811114A CA 2811114 A CA2811114 A CA 2811114A CA 2811114 C CA2811114 C CA 2811114C
- Authority
- CA
- Canada
- Prior art keywords
- cross beam
- transformer
- fastening point
- door opening
- wind power
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C1/00—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles
- B66C1/10—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles by mechanical means
- B66C1/105—Lifting beam permitting to depose a load through an opening
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C1/00—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles
- B66C1/10—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles by mechanical means
- B66C1/108—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles by mechanical means for lifting parts of wind turbines
Abstract
There is provided a method of replacing a generator of a wind power installation. In that case the generator is provided in the interior of a pylon of a wind power installation and the pylon (140) has a door opening (150). An exchanging cross beam (300) is fixed by way of a first fastening point (310) to a crane hook of a mobile crane (500). A first end of the cross beam (300) is introduced with a second fastening point (320) through the door opening (150) into the pylon (140). The transformer (220) to be replaced is fixed to the second fastening point (320) of the first end (300). A compensating weight (400) is fixed at the second fastening point (320) to the second end of the cross beam (300). The second end of the cross beam (300) is tilted or inclined until the transformer is at the height of the door opening (150) and the crane hook is moved until the transformer to be replaced is outside the door opening (150).
Description
Method for replacing a transformer in a wind energy installation The present invention concerns a method of replacing a transformer of a wind power installation.
In modern wind power installations transformers are typically provided in the lower region of the pylon of a wind power installation. The transformers can be used to transform an output voltage of a power cabinet of a wind power installation into a voltage required for an electrical network to which the wind power installation is connected.
The transformers typically have only a limited service life so that, during the service life of the wind power installation, it can happen that a transformer has to be replaced. Hitherto special mobile cranes with heavy-duty tips were required to replace the transformers. In that case a crane jib can be moved through a door opening into the pylon of the wind power installation to connect to the transformer and lift it out. As the dimensions of the door openings are limited a crane jib with a heavy duty tip is required.
As general state of the art attention is directed to DE 32 11 390 Al and DE 10 2008 035.
An object of the present invention is to provide a method of replacing a transformer of a wind power installation, in which a special crane is not required.
That object is attained by a method of replacing a transformer of a wind power installation as described below.
Thus there is provided a method of replacing a generator of a wind power installation. In that case the generator is provided in the interior of a pylon of a wind power installation and the pylon has a door opening. An exchanging cross beam is fixed by way of a first fastening point to a crane hook of a mobile crane. A first end of the cross beam is introduced with a second fastening point through the door opening into the pylon. The transformer to be replaced is fixed to the second fastening point of the first
In modern wind power installations transformers are typically provided in the lower region of the pylon of a wind power installation. The transformers can be used to transform an output voltage of a power cabinet of a wind power installation into a voltage required for an electrical network to which the wind power installation is connected.
The transformers typically have only a limited service life so that, during the service life of the wind power installation, it can happen that a transformer has to be replaced. Hitherto special mobile cranes with heavy-duty tips were required to replace the transformers. In that case a crane jib can be moved through a door opening into the pylon of the wind power installation to connect to the transformer and lift it out. As the dimensions of the door openings are limited a crane jib with a heavy duty tip is required.
As general state of the art attention is directed to DE 32 11 390 Al and DE 10 2008 035.
An object of the present invention is to provide a method of replacing a transformer of a wind power installation, in which a special crane is not required.
That object is attained by a method of replacing a transformer of a wind power installation as described below.
Thus there is provided a method of replacing a generator of a wind power installation. In that case the generator is provided in the interior of a pylon of a wind power installation and the pylon has a door opening. An exchanging cross beam is fixed by way of a first fastening point to a crane hook of a mobile crane. A first end of the cross beam is introduced with a second fastening point through the door opening into the pylon. The transformer to be replaced is fixed to the second fastening point of the first
2 end. A compensating weight is fixed at the second fastening point to the second end of the cross beam. The weight of the compensating weight can optionally substantially correspond to the weight of the transformer to be replaced. The second end of the cross beam is tilted or inclined until the transformer is at the height of the door opening and the crane hook is moved until the transformer to be replaced is outside the door opening.
In an aspect of the present invention a new transformer which is to replace the old transformer is provided as the compensating weight and the cross beam is rotated through 1800 and the new transformer at the second fastening point at the second end of the cross beam is guided into the door opening.
In a further aspect of the invention the new transformer is lowered into the operative position by the first end of the cross beam being raised or the cross beam being tilted.
In a further aspect of the invention a first and a second block-and-tackle can be respectively connected to the first fastening point and the second end of the cross beam, in which case then the second end is moved up or down by means of the second block-and-tackle so that the cross beam can be tilted or inclined.
In a further aspect of the invention there is provided a further first fastening point for the cross beam. While the first fastening point is provided at the centre of gravity of the cross beam the further first fastening point is provided outside the centre of gravity so that it is also possible to handle loads of differing weights at the first and second ends of the cross beam.
The present invention also concerns an exchanging cross beam for use in a method of replacing the transformer. The cross beam has an elongate body, a first fastening point for receiving a crane hook of a crane, and a respective second fastening point at the first and second ends of the cross beam for respectively receiving a transformer to be replaced and a compensating weight. The first fastening point is disposed substantially at the centre of gravity of the cross beam.
In an aspect of the present invention a new transformer which is to replace the old transformer is provided as the compensating weight and the cross beam is rotated through 1800 and the new transformer at the second fastening point at the second end of the cross beam is guided into the door opening.
In a further aspect of the invention the new transformer is lowered into the operative position by the first end of the cross beam being raised or the cross beam being tilted.
In a further aspect of the invention a first and a second block-and-tackle can be respectively connected to the first fastening point and the second end of the cross beam, in which case then the second end is moved up or down by means of the second block-and-tackle so that the cross beam can be tilted or inclined.
In a further aspect of the invention there is provided a further first fastening point for the cross beam. While the first fastening point is provided at the centre of gravity of the cross beam the further first fastening point is provided outside the centre of gravity so that it is also possible to handle loads of differing weights at the first and second ends of the cross beam.
The present invention also concerns an exchanging cross beam for use in a method of replacing the transformer. The cross beam has an elongate body, a first fastening point for receiving a crane hook of a crane, and a respective second fastening point at the first and second ends of the cross beam for respectively receiving a transformer to be replaced and a compensating weight. The first fastening point is disposed substantially at the centre of gravity of the cross beam.
3 The invention concerns the idea of providing a method of replacing a transformer of a wind power installation, wherein there are provided a cross beam having a first fastening point for attachment of a crane hook of a crane and two further fastening points to which the transformer to be replaced and a compensating weight can be fastened. To replace the defective transformer to be replaced, an end of the cross beam is introduced into the door opening of a pylon of the wind power installation and the transformer to be replaced is attached to the fastening point. The second end of the cross beam then projects out of the pylon and a compensating weight such as for example the new transformer can be attached at the second fastening point. If the compensating weight is of substantially the same weight as the generator to be replaced then the cross beam is held substantially in equilibrium and the transformer to be replaced can be lifted out of the door opening.
Optionally the compensating weight can be in the form of the new transformer so that the cross beam only has to be rotated through 180 and the new transformer can be introduced through the door opening. If then the replaced transformer is lifted it can be provided that the cross beam is tilted and the new transformer can be transported to its position.
Optionally the cross beam can be provided with a further first fastening point so that the crane hook can be coupled to the further first fastening point. That further first fastening point is not provided at the centre of gravity of the cross beam so that it is also possible to use compensating weights which do not correspond to the weight of the transformer to be replaced. That is the case for example when the new transformer is lighter or heavier than the transformer to be replaced.
Further configurations of the invention are subject-matter of the appendant claims.
Advantages and embodiments by way of example of the invention are described in greater detail hereinafter with reference to the drawings.
Figure 1 shows a diagrammatic view of a wind power installation and a cross beam when replacing a transformer of the wind power installation according to a first embodiment,
Optionally the compensating weight can be in the form of the new transformer so that the cross beam only has to be rotated through 180 and the new transformer can be introduced through the door opening. If then the replaced transformer is lifted it can be provided that the cross beam is tilted and the new transformer can be transported to its position.
Optionally the cross beam can be provided with a further first fastening point so that the crane hook can be coupled to the further first fastening point. That further first fastening point is not provided at the centre of gravity of the cross beam so that it is also possible to use compensating weights which do not correspond to the weight of the transformer to be replaced. That is the case for example when the new transformer is lighter or heavier than the transformer to be replaced.
Further configurations of the invention are subject-matter of the appendant claims.
Advantages and embodiments by way of example of the invention are described in greater detail hereinafter with reference to the drawings.
Figure 1 shows a diagrammatic view of a wind power installation and a cross beam when replacing a transformer of the wind power installation according to a first embodiment,
4 Figure 2 shows a diagrammatic plan view of a cross beam according to a second embodiment, Figures 3 and 4 show various views of a fastening point of the cross beam of Figure 2, and Figure 5 shows a diagrammatic plan view of a cross beam according to a third embodiment.
Figure 1 shows a diagrammatic view of a wind power installation with a crane for replacing a transformer of the wind power installation according to a first embodiment. The wind power installation 100 has a pod 110, a rotor 120 having a plurality of rotor blades 130 and a pylon 140 having a door opening 150. A transformer 200 is in the lower region of the pylon 140. Figure 1 also shows a crane 500, to the crane hook 510 of which is attached an exchanging cross beam 300.
The cross beam 300 has a first fastening point 310 for receiving a crane hook 510 of the crane 500 and two second fastening points 320 at the first and second ends 321, 322 of the cross beam 300. The second fastening point 320 serves to receive a transformer 200 to be replaced, and a compensating weight 400.
If the transformer 200 of the wind power installation 100 is defective then the cross beam 300 is fixed with the first fastening point 310 to a crane hook 510 and a first end 321 of the cross beam 300 with a second fastening point 320 is introduced through the door opening 150. The transformer 200 can then be fixed to a second fastening point 320 of the first end 321. A compensating weight 400 can be fastened at the other second fastening point 320 at the second end 322. Preferably the weight of the compensating weight 400 substantially corresponds to the weight of the transformer 200 to be replaced. Optionally the new transformer can be used as the compensating weight 400. If the transformer 200 is provided beneath the door opening 150 the first end 321 of the cross beam 300 can firstly be introduced through the door opening 150 and then tilted or inclined, then the transformer 200 can be fixed to the second fastening point 320 at the first end 321 and the second end 322 of the cross beam with the compensating weight 400 can be tilted or inclined so that the . .
transformer 200 at the first end 321 can be moved upwardly and can then be lifted through the door opening 150.
If the new transformer is to be provided as the compensating weight 400 at the second end 322 of the cross beam 300 then the cross beam 300
Figure 1 shows a diagrammatic view of a wind power installation with a crane for replacing a transformer of the wind power installation according to a first embodiment. The wind power installation 100 has a pod 110, a rotor 120 having a plurality of rotor blades 130 and a pylon 140 having a door opening 150. A transformer 200 is in the lower region of the pylon 140. Figure 1 also shows a crane 500, to the crane hook 510 of which is attached an exchanging cross beam 300.
The cross beam 300 has a first fastening point 310 for receiving a crane hook 510 of the crane 500 and two second fastening points 320 at the first and second ends 321, 322 of the cross beam 300. The second fastening point 320 serves to receive a transformer 200 to be replaced, and a compensating weight 400.
If the transformer 200 of the wind power installation 100 is defective then the cross beam 300 is fixed with the first fastening point 310 to a crane hook 510 and a first end 321 of the cross beam 300 with a second fastening point 320 is introduced through the door opening 150. The transformer 200 can then be fixed to a second fastening point 320 of the first end 321. A compensating weight 400 can be fastened at the other second fastening point 320 at the second end 322. Preferably the weight of the compensating weight 400 substantially corresponds to the weight of the transformer 200 to be replaced. Optionally the new transformer can be used as the compensating weight 400. If the transformer 200 is provided beneath the door opening 150 the first end 321 of the cross beam 300 can firstly be introduced through the door opening 150 and then tilted or inclined, then the transformer 200 can be fixed to the second fastening point 320 at the first end 321 and the second end 322 of the cross beam with the compensating weight 400 can be tilted or inclined so that the . .
transformer 200 at the first end 321 can be moved upwardly and can then be lifted through the door opening 150.
If the new transformer is to be provided as the compensating weight 400 at the second end 322 of the cross beam 300 then the cross beam 300
5 only has to be rotated through 180 and the new transformer can be passed through the door opening 150 and the second end 322 of the cross beam 300 can be tilted to move the transformer 300 into its position.
Optionally a first and/or second block-and-tackle 610, 620 can be provided or coupled to the crane hook 510. The first block-and-tackle 610 can be coupled to the first fastening point 630. The second block-and-tackle 620 can be coupled to the second end 322 of the cross beam. The second end 322 of the cross beam 300 can be raised or lowered by the second block-and-tackle 620 so that the cross beam in itself can be tilted or inclined.
The first and second block-and-tackle 610, 620 can be connected by way of a first and a second round sling to the first fastening point 310 and the second end 320.
The method according to the invention of replacing a defective transformer makes it possible to dispense with a special crane having a heavy duty tip. Only a standard mobile crane is needed to replace the defective transformer.
The method according to the invention of replacing a defective transformer can be used in relation to steel pylons which provide the door opening above the position of installation of the transformer. Alternatively thereto however the method according to the invention can also be used in relation to concrete pylons.
The method according to the invention is particularly advantageous if the transformer is provided beneath the door opening in the pylon of the wind power installation.
Figure 2 shows a diagrammatic view of a cross beam according to a second embodiment. The cross beam of the second embodiment can be used in accordance with the first embodiment. The cross beam 300 has a first fastening point 310 for receiving a crane hook. At its first and second . .
Optionally a first and/or second block-and-tackle 610, 620 can be provided or coupled to the crane hook 510. The first block-and-tackle 610 can be coupled to the first fastening point 630. The second block-and-tackle 620 can be coupled to the second end 322 of the cross beam. The second end 322 of the cross beam 300 can be raised or lowered by the second block-and-tackle 620 so that the cross beam in itself can be tilted or inclined.
The first and second block-and-tackle 610, 620 can be connected by way of a first and a second round sling to the first fastening point 310 and the second end 320.
The method according to the invention of replacing a defective transformer makes it possible to dispense with a special crane having a heavy duty tip. Only a standard mobile crane is needed to replace the defective transformer.
The method according to the invention of replacing a defective transformer can be used in relation to steel pylons which provide the door opening above the position of installation of the transformer. Alternatively thereto however the method according to the invention can also be used in relation to concrete pylons.
The method according to the invention is particularly advantageous if the transformer is provided beneath the door opening in the pylon of the wind power installation.
Figure 2 shows a diagrammatic view of a cross beam according to a second embodiment. The cross beam of the second embodiment can be used in accordance with the first embodiment. The cross beam 300 has a first fastening point 310 for receiving a crane hook. At its first and second . .
6 ends the cross beam has a respective second fastening point 320 for receiving the transformer 200 to be replaced and for receiving a compensating weight 400. The cross beam 300 is so designed that it can bear both the weight of the transformer 200 to be replaced and also the compensating weight 400.
Figures 3 and 4 show a side view and a plan view of the end of the cross beam having a respective second fastening point 320. Two plates 321 each having a hole are provided at the end of the cross beam 300.
There is also a further plate 322 having a larger hole.
Figure 5 shows a diagrammatic plan view of a cross beam in accordance with a third embodiment.
In this case the cross beam according to the third embodiment substantially corresponds to the cross beam of Figure 2. In addition to the cross beam shown there the cross beam of the third embodiment, besides the optional first fastening point 310, has a further first fastening point 311. Optionally further first fastening points can be provided. The first fastening point 310 can be used if the compensating weight which is fastened to the second end substantially corresponds to the weight of the transformer to be replaced.
The further first fastening point 311 can be used if the weight of the compensating weight does not substantially correspond to the weight of the transformer to be replaced. In that case the compensating weight can for example be in the form of the new transformer, in which case the new transformer can be both heavier and also lighter.
Figures 3 and 4 show a side view and a plan view of the end of the cross beam having a respective second fastening point 320. Two plates 321 each having a hole are provided at the end of the cross beam 300.
There is also a further plate 322 having a larger hole.
Figure 5 shows a diagrammatic plan view of a cross beam in accordance with a third embodiment.
In this case the cross beam according to the third embodiment substantially corresponds to the cross beam of Figure 2. In addition to the cross beam shown there the cross beam of the third embodiment, besides the optional first fastening point 310, has a further first fastening point 311. Optionally further first fastening points can be provided. The first fastening point 310 can be used if the compensating weight which is fastened to the second end substantially corresponds to the weight of the transformer to be replaced.
The further first fastening point 311 can be used if the weight of the compensating weight does not substantially correspond to the weight of the transformer to be replaced. In that case the compensating weight can for example be in the form of the new transformer, in which case the new transformer can be both heavier and also lighter.
Claims (6)
1. A method of replacing a transformer (200) of a wind power installation (100), wherein the transformer (200) is provided in the interior of a pylon (140) of the wind power installation (100) and the pylon (140) has a door opening (150), comprising the steps:
- coupling an exchanging cross beam (300) by way of a first fastening point (310) to a crane hook of a crane (500), - introducing a first end (321) of the cross beam (300) with a second fastening point (320) through the door opening (150) into the pylon (140), - fastening the transformer (200) to be replaced to the second fastening point (320) of the first end (321), - fixing a compensating weight (400) to a second fastening point (320) at a second end (322) of the cross beam (300), - tilting or inclining the second end (322) of the cross beam (300) until the transformer (200) is at the height of the door opening (150), and - moving the crane hook until the transformer (200) to be replaced is outside the door opening (150), wherein a new transformer is provided as the compensating weight (400) and the cross beam is rotated through 180 and the new transformer is guided at the second fastening point (320) at the second end (322) into the door opening (150).
- coupling an exchanging cross beam (300) by way of a first fastening point (310) to a crane hook of a crane (500), - introducing a first end (321) of the cross beam (300) with a second fastening point (320) through the door opening (150) into the pylon (140), - fastening the transformer (200) to be replaced to the second fastening point (320) of the first end (321), - fixing a compensating weight (400) to a second fastening point (320) at a second end (322) of the cross beam (300), - tilting or inclining the second end (322) of the cross beam (300) until the transformer (200) is at the height of the door opening (150), and - moving the crane hook until the transformer (200) to be replaced is outside the door opening (150), wherein a new transformer is provided as the compensating weight (400) and the cross beam is rotated through 180 and the new transformer is guided at the second fastening point (320) at the second end (322) into the door opening (150).
2. The method according to claim 1 wherein the new transformer is lowered into the operative position by the first end (321) of the cross beam (300) being raised or tilted.
3. The method according to claim 1 or claim 2 wherein the crane hook is fixed at the second fastening point (320) at the second end (322) of the cross beam (300), by means of a block-and-tackle, so that the second end (322) of the cross beam (300) can be raised or lowered.
4. An exchanging cross beam for use in a method of replacing a transformer of a wind power installation according to one of claims 1 to 3 comprising an elongate body, a first fastening point (310) for receiving a crane hook of a crane, and a respective second fastening point (320) at a first end (321) and at a second end (322) of the cross beam (300) for respectively receiving a transformer (200) to be replaced and a compensating weight (400).
5. The cross beam according to claim 4 wherein the first fastening point (310) is provided substantially at the centre of gravity of the cross beam (300).
6. The cross beam according to claim 4 or claim 5 and further comprising a further first fastening point (310) which is not provided at the centre of gravity of the cross beam.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102010041940A DE102010041940B4 (en) | 2010-10-04 | 2010-10-04 | Method for replacing a transformer of a wind turbine |
| DE102010041940.0 | 2010-10-04 | ||
| PCT/EP2011/067311 WO2012045741A1 (en) | 2010-10-04 | 2011-10-04 | Method for replacing a transformer in a wind energy installation |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2811114A1 CA2811114A1 (en) | 2012-04-12 |
| CA2811114C true CA2811114C (en) | 2015-09-01 |
Family
ID=44735937
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA2811114A Expired - Fee Related CA2811114C (en) | 2010-10-04 | 2011-10-04 | Method for replacing a transformer in a wind energy installation |
Country Status (26)
| Country | Link |
|---|---|
| US (1) | US9027975B2 (en) |
| EP (1) | EP2625130B1 (en) |
| JP (1) | JP5686902B2 (en) |
| KR (1) | KR101526777B1 (en) |
| CN (1) | CN103140430B (en) |
| AU (1) | AU2011311656B2 (en) |
| BR (1) | BR112013006728A2 (en) |
| CA (1) | CA2811114C (en) |
| CL (1) | CL2013000897A1 (en) |
| CY (1) | CY1117903T1 (en) |
| DE (1) | DE102010041940B4 (en) |
| DK (1) | DK2625130T3 (en) |
| ES (1) | ES2582881T3 (en) |
| HR (1) | HRP20160883T1 (en) |
| HU (1) | HUE028872T2 (en) |
| ME (1) | ME02435B (en) |
| MX (1) | MX2013003231A (en) |
| NZ (1) | NZ608454A (en) |
| PL (1) | PL2625130T3 (en) |
| PT (1) | PT2625130T (en) |
| RS (1) | RS55059B1 (en) |
| RU (1) | RU2533764C1 (en) |
| SI (1) | SI2625130T1 (en) |
| TW (1) | TWI461604B (en) |
| WO (1) | WO2012045741A1 (en) |
| ZA (1) | ZA201301959B (en) |
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| US9359174B2 (en) * | 2014-02-20 | 2016-06-07 | The Caldwell Group, Inc. | Composite lifting beam |
| CN107337075B (en) * | 2017-08-02 | 2019-12-17 | 中石化宁波工程有限公司 | Horizontal balancing device for assembling and disassembling bearing box cover of range hood and assembling and disassembling method |
| WO2020102036A1 (en) | 2018-11-15 | 2020-05-22 | B/A Products Co | Lifting device |
| CN112678746A (en) * | 2019-10-18 | 2021-04-20 | 中冶宝钢技术服务有限公司 | Low-position motor replacing device and replacing method thereof |
| EP4039968A1 (en) * | 2021-02-05 | 2022-08-10 | Siemens Gamesa Renewable Energy A/S | Method for connecting a component of a power conversion circuit of a wind turbine |
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| JP4885073B2 (en) | 2007-06-20 | 2012-02-29 | 三菱重工業株式会社 | Wind turbine rotor blade suspension device, wind turbine rotor blade attachment method, and wind turbine generator construction method |
| DE102008035350A1 (en) * | 2008-07-29 | 2010-02-04 | Nordex Energy Gmbh | Wind turbine, has transformer unit including opening detachably closed by wall section in multiple segments of tower, where height and width of opening is larger than height and width of transformer unit |
| US8317244B1 (en) * | 2008-08-22 | 2012-11-27 | Jay Wesley Schuyleman | Apparatus and method for positioning an object in a building |
| CN101685945A (en) * | 2008-09-26 | 2010-03-31 | 佳木斯电业局 | Repair hoisting device and method for isolating switch |
| WO2012114319A1 (en) * | 2011-02-27 | 2012-08-30 | Eitan Leibovitz | Lifting beam |
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